Generic Photoelectric Infrared Count Slot Sensor Module 15mm Slot Width - LM393 Comparator Output

The module provides a single digital output signal via the LM393 comparator. The output is active-low, meaning it defaults to a high logic level when the infrared beam is uninterrupted. When an object breaks the beam within the 15mm slot, the output pin switches to a stable low logic level (0V), which is directly readable by microcontrollers like Arduino or Raspberry Pi.

The module operates from 3.6V to 5V DC. While the supply can be as low as 3.6V, the digital output signal is TTL/CMOS compatible. When powered within this range, the output high logic level will be near the supply voltage (Vcc), and the low level will be near 0V, making it fully compatible with both 3.3V and 5V microcontroller GPIO pins without risk of damage.

No, this particular module features fixed sensitivity. The detection threshold is set internally by the circuit design around the LM393 comparator. It is optimized for reliable detection of opaque objects passing through the 15mm slot. For applications requiring adjustable sensitivity, a different photoelectric sensor module with a potentiometer would be required.

Connect VCC to Arduino's 5V pin, GND to GND, and the module's OUT pin to any digital input pin on the Arduino. In your code, configure the pin as an INPUT_PULLUP to use the Arduino's internal pull-up resistor. The sensor's active-low output will trigger a LOW reading when the beam is broken. You can count these falling-edge transitions to tally objects or calculate speed based on time between pulses.